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No. 285.266. Patented Sept. 18, 1883.

N. PETERS. mto-ljlhographw. Wahinzlnn. c

UNITED STATES PATENT OFFICE.

EDWARD HOW, OF ERIN, ONTARIO, CANADA.

DOUBLE-TREE.

SPECIFICATION forming part of Letters Patent No. 285,266, dated September 18, 1883.

Application filed May 19, 1883. (No model.) V

To all whom it may concern):

Be it known that I, EDWARD How, a subject of the Queen of Great Britain, residing at the township of Erin, in the county of Wellington, in the Province of Ontario, Do-

minion of Canada, have invented certain new and useful Improvements in Double-Trees, of which the following is a specification.

The object of the invention is to arrange the connection between the whiflietrees and double-tree in such a manner that the distance of the point of connection between the whiffietrees and double-tree will be automatically adjusted to and from the pivot-point .of the double-tree, so as to increase or decrease the leverage given each horse by the relative position of the point of connection on the doubletree; and it consists, essentially, in arranging the clips to which the whiffietrees are attached adjustably'on the double-tree and connecting the said clips by a rod pivoted on the pole or other fixture upon which the double-tree is pivoted. In addition to this feature of automatic adjustment I provide for further adjustment at will between the whiffletrees and the clevises, and construct the latter to closely. fit the double-tree and slide thereon.

Figure l is a perspective view of a doubletree with whiffletrees attached according to my invention. Fig. 2 is an enlarged detail, showing the clip on the end of the double-tree.

A is the pole, made as shown, and having the double-tree B pivoted to it. I

O are the whiffletrees connected to the clips D, which, instead of being fixed rigidly to the double tree, are adjustably fitted thereon. The apertures in theclipsare made angular to fit the angular ends of the double-tree, and thus theyare prevented from turning thereon, which would occur if they were round,.unless some special device were used to prevent it.

E is a rod pivoted upon the pole A and connected to the clips D, asin'dicated. Owing to the adjustability of the clips D and to their connection with the rod E, any alteration in the angle of the double-tree will alter the position of the clips 1) on the double-tree-that is to say, if one side of the double tree is drawn forward, the clip on that side of that double-tree will be drawn in toward the pivotpoint of the double-tree, while the clip on the will simultaneously be pushed farther from the pivot-point of the double-tree. It will thus be seen that the horse attached to the end of the double-tree behind the pivot-point will have more leverage than the horse attached to the other clip. Therefore, in the event of one of the horses stumbling, or in any other way being put in a position where he cannot exert the same power as the other horse, his end of the double-tree will of course recede behind the pivot-point; but immediately his leverage is increased the advantage given him enables him to recover himself, the other horse having the greater portion of the load thrown upon him.

In order to prevent the clip going too far out, I provide a stop, F, placed on the end 'of the double-tree, which also prevents the wear of the end of the latter by the motion of the clips.

To enable the leverage to be increased when a young or weak horse is to be coupled with a stronger one, I provide two or more holes in the clip, so that the point of connection of one whiffletree may be placed farther than the point of connection of the other whiifietree from the pivot-point of the double-tree.

I am aware of the Patents Nos. 78, 064, 88,896, and 101,274, and make no claim to the construction shown therein.

What I claim as my invention is In a draft attachment, substantially as described, and in combination with the doubletree B, provided with the stops F, the automati- (ally-adj usting clevises D, having angular orifices therein and closely fitting the doubletree and constructed to slide thereon, and having links forming connections with the whiffletrees, and the bars E, pivoted to the tongue in rear of the pivot of the double-tree, and to the adjustable clevises, whereby the levera-ge given to each horse is automatically increased or diminished, substantially as and for the purposes set forth.

Toronto, April 23, 1883.

EDWARD HOW.

LEWIS TOMLINSON.

- side of the double-tree behind its pivot-point 

